Abstract: A speckle reduction apparatus (300) based on Mie scattering and perturbation drive is disclosed. The speckle reduction apparatus (300) comprises an optical reflective chamber (302) having an incident-light coupling device (301) and an exiting face (303) disposed thereon, and an optical device (308) which faces the incident-light coupling device (301) of the optical reflective chamber (302). The inner walls of the optical reflective chamber (302), except for the wall of light transparent exiting face (303), are mirror surfaces. The optical reflective chamber (302) is fully filled with transparent material (401) having medium particles (402) dispersed therein, which are able to induce Mie scattering of the incident laser. Either or both of the optical reflective chamber (302) and the optical device (308) are provided with a perturbation-sensitive device.

Abstract: A method for improving frozen fish fillets treated by way of a salt-water immersion process includes the following steps: pretreating raw fish to obtain fish fillets; precooling the fish fillets; stacking the precooled fish fillets to obtain a fish fillet stack; freezing the fish fillet stack by using a salt-water immersion process, and performing power-variable ultrasonic wave treatment; and feeding the fish fillets into a cold storage, and performing freezing storage at minus 18 degrees centigrade. The power-variable ultrasonic wave treatment includes: firstly treating for 5 to 10 min under the power of 800 to 600 W, and then changing the power to 200 to 600 W for treating for 5 to 15 min. The freezing time of fish flesh is shortened, and formed ice crystals are fine and uniform, thereby preventing the damage of the formed ice crystals to cell walls.

Abstract: A method for improving frozen fish fillets treated by way of a salt-water immersion process includes the following steps: pretreating raw fish to obtain fish fillets; precooling the fish fillets; stacking the precooled fish fillets to obtain a fish fillet stack; freezing the fish fillet stack by using a salt-water immersion process, and performing power-variable ultrasonic wave treatment; and feeding the fish fillets into a cold storage, and performing freezing storage at minus 18 degrees centigrade. The power-variable ultrasonic wave treatment includes: firstly treating for 5 to 10 min under the power of 800 to 600 W, and then changing the power to 200 to 600 W for treating for 5 to 15 min. The freezing time of fish flesh is shortened, and formed ice crystals are fine and uniform, thereby preventing the damage of the formed ice crystals to cell walls.

Abstract: Speckle reduction apparatus includes a radiation path and a mask arranged within the radiation path. The mask includes an array of electrically controllable cells configured to form a pattern on the mask that varies with time. The speckle reduction mask includes a first linear array including first parallel lines arranged to change the phase of incident radiation, and a second linear array including second parallel lines arranged to change the phase of incident radiation and further arranged such that cells are formed at the intersections of the first parallel lines and the second parallel lines. The speckle reduction mask includes a N1×N2 array of cells, A, formed according to: ATA=??k,l, where AT is the transpose of A, ? is a real and positive constant, dk,l is Kronecker delta and N1?N2.

Abstract: A speckle reduction apparatus (300) based on Mie scattering and perturbation drive is disclosed. The speckle reduction apparatus (300) comprises an optical reflective chamber (302) having an incident-light coupling device (301) and an exiting face (303) disposed thereon, and an optical device (308) which faces the incident-light coupling device (301) of the optical reflective chamber (302). The inner walls of the optical reflective chamber (302), except for the wall of light transparent exiting face (303), are mirror surfaces. The optical reflective chamber (302) is fully filled with transparent material (401) having medium particles (402) dispersed therein, which are able to induce Mie scattering of the incident laser. Either or both of the optical reflective chamber (302) and the optical device (308) are provided with a perturbation-sensitive device.

Abstract: Speckle reduction apparatus includes a radiation path and a mask arranged within the radiation path. The mask includes an array of electrically controllable cells configured to form a pattern on the mask that varies with time. The speckle reduction mask includes a first linear array including first parallel lines arranged to change the phase of incident radiation, and a second linear array including second parallel lines arranged to change the phase of incident radiation and further arranged such that cells are formed at the intersections of the first parallel lines and the second parallel lines. The speckle reduction mask includes a N1×N2 array of cells, A, formed according to: ATA=??k,l, where AT is the transpose of A, ? is a real and positive constant, dk,l is Kronecker delta and N1?N2.